He must have not been too scared since he went back and followed them to the water. If he really would have been afraid he also would not have been so concerned with recording and be more concerned of getting away and doubling back to camp.

Interesting how calm and carefree momma bear was with her two cubs right there. You hear all of the horror stories about momma bears attacking humans when their cubs are around. This bear is obviously use to being around humans or she would have made at least one aggressive gesture towards that guy.